501 Connection rejected by policy [7.7] 40344, please visit www.messagelabs.com/support for more details about this error message

I need a solution

Getting below error message while send emails to clients hosted with Symantec messagelabs.com

Server Name = mail.scanllc.com

Server IP = 5.135.244.62

Please fix the issue. 

Thanks in advance.

Best Regards,

Zarshed

2019-09-04T11:11:53.083Z,SMTP Mail Send Connector,08D72FD2A7AC31D6,3,5.135.244.62:6782,67.219.246.195:25,<,”501 Connection rejected by policy [7.7] 40344, please visit www.messagelabs.com/support for more details about this error message.”,
2019-09-04T11:11:53.083Z,SMTP Mail Send Connector,08D72FD2A7AC31D6,4,5.135.244.62:6782,67.219.246.195:25,*,,”Dropping connection because server is not accepting mail. Server response :501 Connection rejected by policy [7.7] 40344, please visit www.messagelabs.com/support for more details about this error message.”
2019-09-04T11:11:53.083Z,SMTP Mail Send Connector,08D72FD2A7AC31D7,0,,34.225.212.74:25,*,SendRoutingHeaders,Set Session Permissions
2019-09-04T11:11:53.083Z,SMTP Mail Send Connector,08D72FD2A7AC31D7,1,,34.225.212.74:25,*,,attempting to connect
2019-09-04T11:11:53.083Z,SMTP Mail Send Connector,08D72FD2A7AC31D6,5,5.135.244.62:6782,67.219.246.195:25,>,QUIT,
2019-09-04T11:11:53.084Z,SMTP Mail Send Connector,08D72FD2A7AC31D6,6,5.135.244.62:6782,67.219.246.195:25,-,,Remote
2019-09-04T11:11:53.166Z,SMTP Mail Send Connector,08D72FD2A7AC31D7,2,5.135.244.62:6787,34.225.212.74:25,+,,
2019-09-04T11:11:53.251Z,SMTP Mail Send Connector,08D72FD2A7AC31D7,3,5.135.244.62:6787,34.225.212.74:25,<,”220 mail555.messagelabs.com ESMTP Wed, 04 Sep 2019 11:11:51 +0000″,
2019-09-04T11:11:53.251Z,SMTP Mail Send Connector,08D72FD2A7AC31D7,4,5.135.244.62:6787,34.225.212.74:25,>,EHLO mail.scanllc.com,
2019-09-04T11:11:53.334Z,SMTP Mail Send Connector,08D72FD2A7AC31D7,5,5.135.244.62:6787,34.225.212.74:25,<,250  mail555.messagelabs.com Hello ip-100-112-13-60.us-east-1.aws.symcld.net [100.112.13.60] SIZE 52428800 8BITMIME PIPELINING CHUNKING PRDR HELP,
2019-09-04T11:11:53.334Z,SMTP Mail Send Connector,08D72FD2A7AC31D7,6,5.135.244.62:6787,34.225.212.74:25,*,,sending message with RecordId 47407849013301 and InternetMessageId <1AD7D2C0-CE67-4D7E-AAEA-84D526E40D8C@scanllc.com>
2019-09-04T11:11:53.334Z,SMTP Mail Send Connector,08D72FD2A7AC31D7,7,5.135.244.62:6787,34.225.212.74:25,>,MAIL FROM:<solar@scanllc.com> SIZE=54912,
2019-09-04T11:11:53.334Z,SMTP Mail Send Connector,08D72FD2A7AC31D7,8,5.135.244.62:6787,34.225.212.74:25,>,RCPT TO:<STEEVAN-R@marubeni.com>,
2019-09-04T11:11:53.417Z,SMTP Mail Send Connector,08D72FD2A7AC31D7,9,5.135.244.62:6787,34.225.212.74:25,<,250 OK,
2019-09-04T11:11:53.417Z,SMTP Mail Send Connector,08D72FD2A7AC31D7,10,5.135.244.62:6787,34.225.212.74:25,<,421 Service Temporarily Unavailable,
2019-09-04T11:11:53.418Z,SMTP Mail Send Connector,08D72FD2A7AC31D7,11,5.135.244.62:6787,34.225.212.74:25,>,QUIT,
2019-09-04T11:11:53.500Z,SMTP Mail Send Connector,08D72FD2A7AC31D7,12,5.135.244.62:6787,34.225.212.74:25,<,221 mail555.messagelabs.com closing connection,
2019-09-04T11:11:53.501Z,SMTP Mail Send Connector,08D72FD2A7AC31D7,13,5.135.244.62:6787,34.225.212.74:25,-,,Local

0

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